Development of content-stable phase change composites by infiltration into inorganic porous supports

被引:66
作者
Goitandia, Amaia M. [1 ]
Beobide, Garikoitz [2 ]
Aranzabe, Estibaliz [1 ]
Aranzabe, Ana [1 ]
机构
[1] Fdn Tekniker IK4, Surface Chem Unit, Eibar 20600, Spain
[2] Univ Basque Country UPV EHU, Dept Inorgan Chem, E-48080 Bilbao, Spain
关键词
PCM; Phase change composite; Infiltration; Impregnation; Porous support; Mesoporous silica; THERMAL-ENERGY STORAGE; GRAPHITE COMPOSITE; PCM; MONTMORILLONITE; BUILDINGS; WATER;
D O I
10.1016/j.solmat.2014.12.010
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The performance of the vacuum infiltration technique to develop content-stable phase change composites is thoroughly analyzed for a representative spectrum of solid supports that cover a wide range of pore sizes, from micropores (>0.6 nm) to macropores (< 200 mu m). Particularly, the discussion of the results addresses how the porous features affect the amount of embeddable PCM, the phase change properties and the cycling stability of the composites. In terms of latent heat and cycling stability, conventionally used solid supports, such as bentonite, zeolites, diatomaceous earth and expanded graphite, appear to be less advantageous than mesoporous silica. The content stability provided by the nanosized pores of the composite developed with mesoporous silica reduces the risk of PCM leakage and makes this composite suitable for use in building materials without requiring a protective coating. The characterization of the phase change features is also accomplished by thermodiffractometric measurements on composite samples to analyze their main crystallographic properties. Finally, the effect of nano-confinement within the porous matrix on the phase change properties is discussed by focusing on the shifts observed for supercooling and melting point depression. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:318 / 328
页数:11
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